Albert schmid



A. SCHMID AND L. A. MERK.

CAHBURETER.

APPLICATION FILED JUNE 12. ms.

Patented Dec. 23,1919.

n s m ATTORNEY UNITED STATES ra'rn onrron.

ALBERT SGHMID, 0F LONG BEACH, AND LAWRENCE AUGUST MERK SAID MERKASSIGNOR T0 SAID SCHMID.

GARBURETE'R.

Specification of Letters Patent.

Patented Dec. 23, 1919.

Application filed June 12, 1918. Serial No. 239,686.

To all whom itmay concern:

Be it known that we, ALBERT SoHMn) and LAWRENCE AUGUST MERK, citizens ofthe United States, and residents of Long Beach, L. 1., and New Yorkcity, N. Y., respectively, have made a new and useful invention inCarbureters, of which the following is a specification.

' This invention relates to charge forming devices for internalcombustion engines.

The use of heavy not readily inflammable liquidfuels such as keroseneand distillates and many grades of so called commercial gasolene inlnternal combustion engines and especially engines subject to varylnloads makes it important that some means vided by which readilycombustible charges may be supplied during the warming up periods aswell as when the engine becomes warm enough to care for the combustiblecharges supplied by the main charge forming device or carbureter.

An object of this invention is to provide an efficient charge formingdevice including a main carbureter and an auxiliary carbureter bothadapted to be heated by the engine exhaust gases under control of anagent for automatically varying the amount of exhaust gases suppliedthereto in accordance with the pressure or the vacuum in the engineinlet manifold.

In utilizing fuels which are difficult to vaporize we have found that toobtain smokeless operation the combustible mix ture should enter thecylinders of the engine at a relative high temperature when running atlow loads or torques. We have also found that to prevent spontaneouscombustion in the cylinders when operating under heavy loads or heavytorques this combustible mixture should enter the cylinders at thelowest possible temperature consistent with smokeless operation. Thissame requirement also prevails for obtaining maximum output of a givenengine.

A further object of this invention therefore is to provide a device foror system of carburation for fulfilling'the above-requirements.

These, as well as other objects, which will readily appearto thoseskilled in this particular art, we attain in the system diagrammaticallyillustrated in the single sheet of drawings accompanying and forming apart of this application.

e pro-' In carrying out this invention a main carbureter having a fuelnozzle 2, a main air inlet 3, a supplemental air inlet 4, a mixturepassage 5 and a float chamber 6 supplied Withliquid fuel from anysuitable source through pipe 7 is connected to inlet manifold 8 of theengine.

A jacket 9 surrounds the fuel nozzle and the mixture passage and thusprovides a heating chamber 10 which is connected up to the exhaustmanifold 11 of the engine through a suitable pipe or conduit 12. Themain exhaust pi e 13 of the engine connects with a SllltiHJlG mufflernot shown and beyond a valve device 14, to be hereinafter described, isconnected to heating chamber lO'by means of a branch pipe 15. The maincarburetor is provided with a throttle valve 16 which controls the flowof mixture through passage 5 andtherefore the delivery of fuel fromnozzle 2. The throttle valve 16 will be-under the control of theoperator of the engine through mechanism connected with lever 17 foroperating said valve. Valve 14 consists of a balanced valve 18, the stem19 of which connects with a piston 20 operating within a cylinder 21 andnormally the valve is held open by means of a spring 22 interposedbetween piston 20 and head 23 of the cylinder. End 24 of the cylinder isopen to the atmospherethrough a port 25 and the opposite end of thecylinder is connected up to inlet manifold 8' of the engine by means ofa pipe 26 and in this pipe a valve 27 is included for the purpose ofcutting out the automatic operation of said valve device 14 when thefuel supplied to the main carbureter is a readily inflammable liquidsuch as high grade gasolene.

By closing valve 27 the valve 18 will normally be held in open positionby spring 22.

For the purpose of starting and for running the engine during warming upperiods we have included in the system a starting or auxiliarycarbureter and this may be similar to one or the other of thoseillustrated and described in applications for Letters Patent filedconcurrently herewith by Albert Schmid, one of the inventors in thisapplication. The starting carbureter as illustrated consists of atortuous passage 30 coiled about a tubular member 31 which forms asection of exhaust pipe 12 but which is preferably insulated from theother sec tions of the pipe by means of heat insulating or NEW YORK, N.Y.,

of a controlling valve device 32 supplied with fuel through a pipe 33,and the mixture,

from the tortuous-passage enters the inlet manifold 8 of the engine bymeans of a connecting pipe 34. An electric heater 35 arranged in heattransferring relation to said tortuous passage is supplied with electriccurrent from a source of supply such as a storage battery 36 throughlines 37 controlled by a switch 38. The tortuous passage andthe-electrical heater are submerged in a heat storage material 39 suchas lead which is poured around the walls of the tortuous passage and theelectricheater so as to bein heat transferring relation to the tortuouspassage so that heat from the exhaust pipe will be transferred to theheat storage material.

The auxiliary carbureter is under the control of the operator by meansof a bell crank lever 40 and other suitable connections (not shown)which control the operation of the valve device 32. In starting up thesystem, throttle valve 16 of the main carbureter will be closed andelectric current will be turned on to the electric heater element, andon account of the relatively small size of the starting carbureter thewalls of the tortuous passage will be heated in a short timesufficiently to supply heat to the mixture flowing through the passageso that readily combustible charges may be supplied to the engine. Y

During this time the valve 18 will be closed owing to the vacuum in theinlet manifold which will be transmitted to the spring chamber of valvedevice 14:; atmospheric pressure operating on piston 21 against thestress of spring 22 holding said valve closed. All of the exhaust gasestherefore from the engine will pass through exhaust passage 12 heatingthe tortuous passage of the auxiliary carbureter aswell as the heatabsorbing material and will also heat the main carbureter as it iscaused to pass throu h heating chamber 10 on its way to the mu er. Assoon as the main carbureter is sufficiently heated to care for the loadon the engine, the auxiliary carbureter will be shut off byclosing'valve device 32 and all of the charges will be supplied by themain carbureter.

The valve device 14: will act automatically in accordance with thepressure in the inlet manifold to properly proportion the amount ofexhaust gases passing through the heating chalnber 10 and at light loadsor torques all of the exhaust gases will be sent through heating chamber10 thus heating up the mam carbureter body. As the load therebypreventing spontaneous combustion in the engine cylinders as well asinsuring maximum engine output.

Having thus described our invention what we claim is 1. The combinationwith a main carbureter, of an auxiliary carbureter and heating chambersfor both of said carbureters through which exhaust gases from the engineare adaptedto pass in series relation.

2. The combination with a main carbureter and anauxiliary carbureterhaving mixture passages arranged in parallel relation one to the other,of heating chambers for both of said carbureters through which exhaustgases from the engine are adapted to pass in series relation and meansthe operation of which is dependent upon the pressure in the engineinlet manifold for controlling the amount of exhaust gases passingthrough said chambers.

3.- The combination with an engine inlet manifold, of a carbureterattached thereto and provided with a heating chamber, 1neans' forpassing exhaust gases through said chamber, and means the operation ofwhich is dependent upon the pressure in the inlet manifold forcontrolling the flow of exhaust gases to said heating chamber.

4. The combination with a main and an auxiliary carbureter,

heated by exhaust gases from the-engine to both adapted to be passingexhaustgases in relation to said carbureters and a controlling devicethe operation of which is dependent upon the pressure within the engineinlet manifold for controlling the flow of exhaust gases to saidcarbureters.

5. The combination with an engine inlet manifold, of a carbureterattached thereto and provided with rounding the same, means for causingexhaust gases to by-pass said chamber and a controlling device theoperation of which is dependent upon the pressure within the engineinlet manifold for controlling the flow of exhaust gases to said heatingchamber.

6. The combination with an engine inlet manifold, of a carbureterattached thereto and provided with a heating chamber, a conduit forleading exhaust gases through said operation of which is dependent uponthe a heating chamber 'sur-' pressure in the inlet manifold forcontrolling the operation of said valve.

he combination With a main carbuinlet manifold for controlling the flowof exhaust gases through said chambers. 10 In testimony whereof, we havehereunto reter, of an auxiliary carbureter, heating subscribed our namesthis 5 day of June, chambers for both of said carbureters through 1918.

which exhaust gases from the engine are adapted to pass, and means theoperation of ALBERT SCHMID.

which is dependent upon the pressure in the LAWRENCE AUGUST MERK.

